I am not sure how new the string is, since the earliest review I was able
to find dates back to December 2012, but the string does not seem to
be available on the North American market yet. There is no mention of it on the
Kirschbaum USA website.
Kirschbaum describes it as their newest development for players seeking
the highest level of comfort and maximum feel and arm protection.
The multifilament core is said to provide gut-like playability.
I am not able to verify the last claim since I have never tried natural gut,
but based on my initial impressions I can say the string delivers what it
promises: a very comfortable and soft feel.
According to the product description, the core consists of 1400 high-grade
polyamid multi-filament fibres.
The string also undergoes "plasma treatment and thermosetting" for improved
durability and tension maintenance. Like all other Kirschbaum strings,
the Gut Feeling comes factory pre-stretched.
It's available in two gauges: 1.25 mm and 1.30 mm and only natural color.

Side note: This is the first Kirschbaum string I have ever tried.
More in-depth review coming tomorrow night.

Apart from the new Gut Feeling string, Kirschbaum does offer a few other
multifilament strings: Touch Multifibre, Touch Classic, Touch Titanium
and Synthetic Gut Multi. But it's true, they are more famous for their
co-poly strings.

Kirschbaum makes great strings and if this new string plays better than Touch Multifiber, then they have a winner on their hands.

I just checked out the reviews on stringforum site and a couple people mention it has better tension maintenance but mixed about whether it is better than X1 Biphase. The only issue is the price is way high for a multi at 23 euros.

I've played Kirscbaum for a while now and they make fantastic poly's. I agree that they make some of the best co-poly's on the market. I cant speak for their Syn guts or multi's but the company as a whole makes quality stuff. Also, I doubt they would price it in the US anywhere near 23€.

If they price it around where Multi Touch Fibre is currently selling for, I will buy a set and provide feedback on it. I haven't done many reviews since I pretty much found my ideal string combo of gut mains and poly cross specially VS/Prince/Wilson gut mains and Ltec 4S crosses.

The Kisrchbaum Evolution was one of my top 3 as a cross so definitely had good experience with this company.

This is exciting, sounds great! I love this company and eagerly await its release into North America.

I talked to Sandra Kirschbaum yesterday and she said their North American
distributor currently does not stock the new Gut Feeling string, without
providing an estimated release date. I think they are still trying to determine
if there is enough demand to introduce the string to the North American
market.

@parasailing: I have not tried the Touch Multifibre string, but according
to Kirschbaum newer and even higher-end materials were used for the
Gut Feeling, so based on that it should in theory play better.

At 23 Euros for a pack of strings, the Gut Feeling is even more expensive
than Tecnifibre's X-One BiPhase, but whether it is better is a subjective
matter. They are both great strings. I can not quite make a fair comparison,
even though I currently use both strings, because they are strung in two
different racquets, and they are different gauges.
I have 1.25 mm Gut Feeling in my Yonex EZone Xi 100 racquet, and
1.30 mm X-One in my VCore Xi 100.

All I can say is that Kirschbaum's Gut Feeling is the softest and most
comfortable string I have ever used. Power and control is out of control.
And it provides a very nice organic feel.
That is all I want from a tennis string.
I have mine strung at 23 kg mains and 22 kg cross.

Note: the Gut Feeling string is also available as a 110 m reel priced at 130 Euros,
allowing to string up to 9 racquets, lowering the cost for each string set
down to 14 Euros.